Batman and Robin (1949)
[Vickie receives a phone call from "Bruce Wayne" that is actually a recording]
Bruce Wayne: Vickie, I'm sorry, I can't keep our date. I need a vacation; I'm leaving town for a week. You understand, don't you?
Vicki Vale: Well, of course, Bruce. You must be completely worn out.
Vicki Vale: You know, I thought I had discovered your identity, but I just found out I was wrong.
Batman: Really? Who did you think I was?
Vicki Vale: Bruce Wayne. Wasn't that silly?
Batman: Yes, wasn't it?
Robin: What's botherin' you?
Batman: Harrison's safety. The Wizard must have heard that broadcast - perhaps he even inspired it.
Robin: Harrison's decision really must have knocked the props out from under his blackmail scheme.
Batman: Yeah, that's what I'm afraid of. What's to prevent the Wizard from attacking Harrison on his way here?
Robin: Batman and Robin might.
Narrator: Crime, striking our city night and day, is on the increase. Our undermanned police force is helpless to cope with the situation, but they have an ally - Batman - who with the faithful Robin, wages unending war against all criminals!
Batman: Run the usual test for invisible ink. I'll change and go entertain Vicki.
Robin: You better be careful. I think she's beginning to get wise that Batman and Bruce Wayne are the same.
Batman: Well, if she gets too close, we know how to throw her off the trail.
Officer Murphy: You can't go in there!
Vicki Vale: Well, I'm Vicki Vale of Picture magazine.
Officer Murphy: Vicki Vale, eh? Well, I'm Officer Murphy of the Patrol Bureau. You still can't go in there!